Stelpro
Stelpro Smart Thermostats Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
Thermostat display shows E1 and heating does not turn on
Room Temperature Sensor Open Circuit
E10
Thermostat shows E10 and the screen may be dim or unresponsive
Low Supply Voltage / Power Input Fault
E11
Thermostat displays E11 and buttons or touch interface do not respond correctly
User Interface / Keypad Failure
E12
Thermostat shows E12 and schedules or settings are lost after power outages
Backup Power / Real-Time Clock Failure
E13
Thermostat displays E13 and cannot join Zigbee/Z-Wave or other smart home network (for multi-protocol models)
Auxiliary Radio Module Error
E14
Thermostat shows E14 and heating cycles erratically or not at all
Internal Temperature Calibration Error
E15
Thermostat displays E15 and refuses to start a firmware update
Firmware Integrity / Signature Verification Error
E16
Thermostat shows E16 and the backlight or display does not turn on properly
Display Backlight / LCD Driver Fault
E17
Thermostat displays E17 and reports incompatible load or wiring
Load Type Detection Error
E2
Thermostat display shows E2 and room temperature reading is incorrect or dashes
Room Temperature Sensor Short Circuit
E3
Thermostat shows E3 and will not control floor heating properly (for models with floor sensor option)
External Floor Sensor Open or Not Detected
E4
Thermostat shows E4 and floor temperature reading is incorrect or dashes (floor heating models)
External Floor Sensor Short Circuit
E5
Thermostat displays E5 and heating output is disabled
Overtemperature Protection / Internal Overheat Fault
E6
Thermostat shows E6 and cannot connect to Wi-Fi or cloud services
Wi-Fi Module Communication Failure
E7
Thermostat displays E7 and does not respond to app commands
Cloud Service / Server Communication Error
E8
Thermostat shows E8 and the display may flicker or freeze
Internal Memory / EEPROM Error
E9
Thermostat displays E9 and cannot control the heating load
Output Triac/Relay Failure
Symptom
Thermostat buttons or touchscreen are unresponsive or respond intermittently
User Interface Input Failure
Symptom
Thermostat calls for heat but connected Stelpro baseboard or convector does not warm up
Heater Not Heating Despite Call
Symptom
Thermostat cannot be added to Stelpro app or pairing fails repeatedly
Initial Pairing / Provisioning Failure
Symptom
Thermostat cannot control Stelpro heater with built-in fan (fan does not run or runs continuously)
Fan Control Misconfiguration (Fan-Forced Heater)
Symptom
Thermostat cannot detect or use external floor sensor (no error code shown)
Floor Sensor Not Recognized
Symptom
Thermostat display is on but completely blank or shows only backlight
Display Data / LCD Failure
Symptom
Thermostat does not power on at all (blank screen, no lights)
No Power to Thermostat
Symptom
Thermostat emits a buzzing or humming noise when calling for heat
Electrical Noise from Output Stage
Symptom
Thermostat emits a plastic or burning smell during operation
Overheating / Component Failure with Odor
Symptom
Thermostat frequently disconnects from Wi-Fi or app shows it as offline
Intermittent Wi-Fi Connectivity
Symptom
Thermostat makes clicking noises very frequently (short cycling)
Short Cycling of Heating Output
Symptom
Thermostat or wall around it feels unusually warm to the touch
Thermostat Overheating
Symptom
Thermostat overshoots set temperature and room becomes too hot
Temperature Overshoot / Poor Regulation
Symptom
Thermostat powers on but does not call for heat even when setpoint is higher than room temperature
No Heat Call / Control Logic Fault
Symptom
Thermostat randomly resets or reboots during normal operation
Unexpected Reboot / Power Instability
Symptom
Thermostat schedules do not follow the programmed times or temperatures
Scheduling / Programming Fault
Symptom
Thermostat shows energy usage or consumption data that seems clearly wrong
Energy Monitoring / Metering Error
Symptom
Thermostat shows incorrect time or schedule triggers at wrong times
Clock / Timekeeping Issue
Symptom
Thermostat shows very different temperature from other rooms or from a reference thermometer
Temperature Reading Inaccurate
Symptom
Thermostat underheats; room never reaches setpoint even though heater runs
Insufficient Heating Capacity or Misconfiguration
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Thermostat display shows E1 and heating does not turn on
|
Room Temperature Sensor Open Circuit | View Details |
| E10 |
Thermostat shows E10 and the screen may be dim or unresponsive
|
Low Supply Voltage / Power Input Fault | View Details |
| E11 |
Thermostat displays E11 and buttons or touch interface do not respond correctly
|
User Interface / Keypad Failure | View Details |
| E12 |
Thermostat shows E12 and schedules or settings are lost after power outages
|
Backup Power / Real-Time Clock Failure | View Details |
| E13 |
Thermostat displays E13 and cannot join Zigbee/Z-Wave or other smart home network (for multi-protocol models)
|
Auxiliary Radio Module Error | View Details |
| E14 |
Thermostat shows E14 and heating cycles erratically or not at all
|
Internal Temperature Calibration Error | View Details |
| E15 |
Thermostat displays E15 and refuses to start a firmware update
|
Firmware Integrity / Signature Verification Error | View Details |
| E16 |
Thermostat shows E16 and the backlight or display does not turn on properly
|
Display Backlight / LCD Driver Fault | View Details |
| E17 |
Thermostat displays E17 and reports incompatible load or wiring
|
Load Type Detection Error | View Details |
| E2 |
Thermostat display shows E2 and room temperature reading is incorrect or dashes
|
Room Temperature Sensor Short Circuit | View Details |
| E3 |
Thermostat shows E3 and will not control floor heating properly (for models with floor sensor option)
|
External Floor Sensor Open or Not Detected | View Details |
| E4 |
Thermostat shows E4 and floor temperature reading is incorrect or dashes (floor heating models)
|
External Floor Sensor Short Circuit | View Details |
| E5 |
Thermostat displays E5 and heating output is disabled
|
Overtemperature Protection / Internal Overheat Fault | View Details |
| E6 |
Thermostat shows E6 and cannot connect to Wi-Fi or cloud services
|
Wi-Fi Module Communication Failure | View Details |
| E7 |
Thermostat displays E7 and does not respond to app commands
|
Cloud Service / Server Communication Error | View Details |
| E8 |
Thermostat shows E8 and the display may flicker or freeze
|
Internal Memory / EEPROM Error | View Details |
| E9 |
Thermostat displays E9 and cannot control the heating load
|
Output Triac/Relay Failure | View Details |
| – |
Thermostat buttons or touchscreen are unresponsive or respond intermittently
|
User Interface Input Failure | View Details |
| – |
Thermostat calls for heat but connected Stelpro baseboard or convector does not warm up
|
Heater Not Heating Despite Call | View Details |
| – |
Thermostat cannot be added to Stelpro app or pairing fails repeatedly
|
Initial Pairing / Provisioning Failure | View Details |
| – |
Thermostat cannot control Stelpro heater with built-in fan (fan does not run or runs continuously)
|
Fan Control Misconfiguration (Fan-Forced Heater) | View Details |
| – |
Thermostat cannot detect or use external floor sensor (no error code shown)
|
Floor Sensor Not Recognized | View Details |
| – |
Thermostat display is on but completely blank or shows only backlight
|
Display Data / LCD Failure | View Details |
| – |
Thermostat does not power on at all (blank screen, no lights)
|
No Power to Thermostat | View Details |
| – |
Thermostat emits a buzzing or humming noise when calling for heat
|
Electrical Noise from Output Stage | View Details |
| – |
Thermostat emits a plastic or burning smell during operation
|
Overheating / Component Failure with Odor | View Details |
| – |
Thermostat frequently disconnects from Wi-Fi or app shows it as offline
|
Intermittent Wi-Fi Connectivity | View Details |
| – |
Thermostat makes clicking noises very frequently (short cycling)
|
Short Cycling of Heating Output | View Details |
| – |
Thermostat or wall around it feels unusually warm to the touch
|
Thermostat Overheating | View Details |
| – |
Thermostat overshoots set temperature and room becomes too hot
|
Temperature Overshoot / Poor Regulation | View Details |
| – |
Thermostat powers on but does not call for heat even when setpoint is higher than room temperature
|
No Heat Call / Control Logic Fault | View Details |
| – |
Thermostat randomly resets or reboots during normal operation
|
Unexpected Reboot / Power Instability | View Details |
| – |
Thermostat schedules do not follow the programmed times or temperatures
|
Scheduling / Programming Fault | View Details |
| – |
Thermostat shows energy usage or consumption data that seems clearly wrong
|
Energy Monitoring / Metering Error | View Details |
| – |
Thermostat shows incorrect time or schedule triggers at wrong times
|
Clock / Timekeeping Issue | View Details |
| – |
Thermostat shows very different temperature from other rooms or from a reference thermometer
|
Temperature Reading Inaccurate | View Details |
| – |
Thermostat underheats; room never reaches setpoint even though heater runs
|
Insufficient Heating Capacity or Misconfiguration | View Details |
No matching codes found
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